Bobbi,
I am not sure what your doc explained, or his testing....(ask if you can read the companies literature, or look up the site) but unless you inhaled and it went into your blood stream the drug testing, test ppm, and it would not show positive. You would have to have a high reading to show. It may show but it would not be a positive test. For example, If I remember they look for 1000 ppm for cocine, under and showing metabolites, it is likely a false positive test.

the follicle testing is done as the hair grows and nourishment from the body feeds it, there is whatever the drug is traveling through the body systems to make hair grow. The length of the hair is how far back, but after awhile I don;t think it is reliable. It is reliable for many months though.

If anyone has a positive test, there are legit false positives as the test I have seen use, test or metabolites of drugs, not the single drug itself. When a recent drug test was taken for medical, the doctor had to note that recent dental work was done. This helped as when it came back for metabolites for Cocaine present, the scientist could then retest with the knowledge not to bias him, to look for cocaine. The second test concluded it was not cocaine.

The anesthesia that was used for root canal had left it in the body.
be up front about all meds, even the over the counter ones. I have seen test that people using seraquol had a positive but low ppm for metabolites of cocaine.

Thesetest are not 100%. Always immediately retest, make sure it is not a inexpensive test....make sure it is a GOOD one. It is not fair to people in pain for a doctors office to use a dip test and show only metabolites that will risk whether they are labeled drug seekers. A scientific lab will be the best bet, as the retest will always break down.

One thing too, these test are sensitive enough to pick up codine in cough syrup, let them know so they can test the PPL to rule out illegal drugs. Also the cold remedies and cough with alcohol in it, like Nyqual, will test positive for alcohol for those that are test like CDL drivers or employment test.
Recently they had 33 new hires at a place I am familiar with; 28 failed the drug test for hire......
Also., you would have to eat a ton of poppy seed bagels to get a high ppm to establish drugs. That is why our Juv probation department switched to scientific testing to avoid a good defense attorney stating that argument. You can get false positives on cheap test from what I heard in the argument. OR the argument was raised and cast resonable doubt.

In a date book, any med from another doctor, keep a list, name and dose. refer to it when asked for a drug test...if you take over the counter at that time mention it, if dental work, mention that. Even if you take health food stuff...
Most test are fine for folks, just routine.
Pee adn send to lab, and OK. as long as the doctor has a list of EVERY med you take, took, even if someone gave you a vailum, they last long in the system.
Di